[OpenWrt-Devel] [RFC] ath79: support for MikroTik wAP AC: vmlinux.elf + DTB file

[Roger Pueyo Centelles | Guifi.net]

Hi,

I am trying to port the "MikroTik RouterBOARD wAP G-5HacT2HnD", also
known as "wAP AC" to ath79 (it's already supported in ar71xx) and I got
stuck. I think I can't add the corresponding DTB to the kernel image,
which has to be in ELF format so that the bootloader accepts it.

So far, I get the device to boot the vmlinux.elf or the
vmlinux-initramfs.elf images and show some output on the console, but it
stops immediately. From what I have been able to find around, I suspect
that the line:

[    0.000000] OF: fdt: No valid device tree found, continuing without

suggests that the DTB was not appended to the kernel, so it can not be
parsed and the device ends up stopping at:

[    0.000000] Failed to get CPU node
[    0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns,
wraps every 21474836475000000ns


I would like to ask you for your advice on how to generate the ELF
images so that they include the dtb, since I am not able to make it and
I can't go beyond that on supporting the device.

Please find attached the complete boot log (28 lines) and the patch I
have been working on (also at
https://github.com/rogerpueyo/openwrt/tree/ath79-mikrotik-rb-wapg-5hact2hnd_wip).

Thank you very much,

Roger



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[    0.000000] Linux version 4.19.79 (le at builder) (gcc version 8.3.0 (OpenWrt GCC 8.3.0 r11237-d1072096f4)) #0 Tue Oct 15 21:31:13 2019
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[    0.000000] SoC: Qualcomm Atheros QCA9556 ver 1 rev 0
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 04000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] OF: fdt: No valid device tree found, continuing without
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000003ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000003ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000003ffffff]
[    0.000000] random: get_random_bytes called from start_kernel+0x98/0x4a8 with crng_init=0
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 16240
[    0.000000] Kernel command line:   rootfstype=squashfs,jffs2
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 50756K/65536K available (4273K kernel code, 178K rwdata, 1008K rodata, 8036K init, 206K bss, 14780K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS: 51
[    0.000000] Failed to get CPU node
[    0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
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